<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
  <script>
      //900xxxx
    //js  number 超过 长度 2**53 -1  失真
    alert(1978437243866017794)
    alert("1978437243866017794")
  </script>
</body>
</html>